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2 Yamaha 425ís vs 3 300ís?

Old 09-18-2019, 12:30 PM
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Default 2 Yamaha 425ís vs 3 300ís?

Looking at a new boat, a Cobia 350, the two engine packages are dual 425ís or trip 300ís, any reason to avoid the new 425ís? Iíve been on the boat with trip 300ís, I donít think 50 less hp is going to be a performance issue, Iím more concerned about durability and maintenance issues. It will be for dinner runs and fishing in the gulf.

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09-19-2019, 12:01 PM
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Originally Posted by v12mac View Post
Exactly. Who drops a lower and isn't planning on putting it back? 😎
A thief.
Old 09-18-2019, 12:32 PM
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What's the difference in price and is that a consideration?
Old 09-18-2019, 12:33 PM
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Originally Posted by acme54321 View Post
What's the difference in price and is that a consideration?
The twins are about $8000.00 less than the trips. But, thatís not an overriding factor, Iíd hate to save a little money and hare myself over it.
Old 09-18-2019, 12:42 PM
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Originally Posted by N747JB View Post
Looking at a new boat, a Cobia 350, the two engine packages are dual 425ís or trip 300ís, any reason to avoid the new 425ís? Iíve been on the boat with trip 300ís, I donít think 50 less hp is going to be a performance issue, Iím more concerned about durability and maintenance issues. It will be for dinner runs and fishing in the gulf.
Two engine packages with different components.
Maintenance and fuel cost about the same.
Probably the biggest deciding factor is "get home" speed.
With trips you come home at speed on two, with twins you come home at beer speed with one.
If you haven't run trips, the center engine hangs lower and it will remind you of that, quickly.
F300's are proven, XF425's not as much, although we have not heard of any "Quirks".
I have trips and like them, but, a set of XF425's? They do sound NICE.
Tough choice.

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Old 09-18-2019, 01:59 PM
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We were coming in from snapper fishing during the long, draw out season they gave us and had a 35 Everglades with twin 425's pass us just before we hit the inlet. We were running about 35 mph. They were running about 45. Not sure if he was on the pins or not. What kind of speeds are you hoping for?
Old 09-18-2019, 04:07 PM
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Demo both. On a 33' i had the choice of twins or trips, granted I excluded Yamahas and was only considering Mercury. I love the bite of three props and my boats overall performance with the third motor. Also if one goes down i can make good speed with 2.
Old 09-18-2019, 04:11 PM
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I would trip it. Love me some yam 300s. While I get the point of the 425 it doesnít excite me. Iíve seen a few on the big hcbís floating around here and they did well with the styling.
Old 09-18-2019, 04:33 PM
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Twins - Less cost. Less maintenance. Less stuff to break. Less throttles to deal with.

Trips - Only real benefit is that if an engine goes out, you probably have enough reserve power to come in on plane. With twins, you are going to be moving at a semi-displacement speed.

My guess is performance is probably very close. Twins have 50 less hp, but less resistance in the water. Performance bulletins on other boats with similar setups have been within about 1mph of each other.

Personally, I would get the twin 425s. Modern outboards are so reliable if you keep them maintained. In 25 years of boating, thousands of thousands of hours on single engine rigs, I have been towed once and it wasnít an engine issue. Keep your batteries maintained, engine in good shape, carry some basic tools, a few parts, and a spare prop/hub, and donít worry about it.
Old 09-18-2019, 04:48 PM
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dual 425s. Triple cant be upgraded and duals can always be tripled or a third kicker attached.
Old 09-18-2019, 04:51 PM
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Originally Posted by sailphish View Post
Twins - Less cost. Less maintenance. Less stuff to break. Less throttles to deal with.

Trips - Only real benefit is that if an engine goes out, you probably have enough reserve power to come in on plane. With twins, you are going to be moving at a semi-displacement speed.

My guess is performance is probably very close. Twins have 50 less hp, but less resistance in the water. Performance bulletins on other boats with similar setups have been within about 1mph of each other.

Personally, I would get the twin 425s. Modern outboards are so reliable if you keep them maintained. In 25 years of boating, thousands of thousands of hours on single engine rigs, I have been towed once and it wasnít an engine issue. Keep your batteries maintained, engine in good shape, carry some basic tools, a few parts, and a spare prop/hub, and donít worry about it.
The throttles are exactly the same for either set-up. (With the exception of trim button and a selector switch).
I bet the twin XF425's are the same as trip F300's to maintain.
Old 09-18-2019, 04:57 PM
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Now hang on.. "less maintenance "

According to Yamaha some things change with the 425's. I was instructed to not drop the lowers without our 1 offical certified tech present as they are very heavy and no longer allowed to be dropped without a whole riggamorole. Do you plan on dooing your own service?

5 fuel pumps per motor? Is that less maintenance than 2?

16 cyl vs 18 cyl, 3 props vs 2?

Do you run shallow back to the dock? That pushed me to twins.

It all comes down to what you want.
Old 09-18-2019, 05:11 PM
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Originally Posted by v12mac View Post
Now hang on.. "less maintenance "

According to Yamaha some things change with the 425's. I was instructed to not drop the lowers without our 1 offical certified tech present as they are very heavy and no longer allowed to be dropped without a whole riggamorole. Do you plan on dooing your own service?

5 fuel pumps per motor? Is that less maintenance than 2?

16 cyl vs 18 cyl, 3 props vs 2?

Do you run shallow back to the dock? That pushed me to twins.

It all comes down to what you want.
The fuel pumps, one is a lift pump, no maintence, two are VST's, with one being a (back up/WOT pump), the other two are mech HP pumps, no standard maintence.
Spark plugs are Iridium, not changed every 100 hrs or more.
The lower unit is HEAVY, it has no problem coming down, up is the issue, it's either a two person deal or a special sling and hoist deal.
The XF425 is a BIG engine.
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Old 09-19-2019, 11:52 AM
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Originally Posted by Parker Yacht View Post
The fuel pumps, one is a lift pump, no maintence, two are VST's, with one being a (back up/WOT pump), the other two are mech HP pumps, no standard maintence.
Spark plugs are Iridium, not changed every 100 hrs or more.
The lower unit is HEAVY, it has no problem coming down, up is the issue, it's either a two person deal or a special sling and hoist deal.
The XF425 is a BIG engine.
Exactly. Who drops a lower and isn't planning on putting it back? 😎
Old 09-19-2019, 12:00 PM
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I bet the twin 425 sound better than the trip 300
Old 09-19-2019, 12:01 PM
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Originally Posted by v12mac View Post
Exactly. Who drops a lower and isn't planning on putting it back? 😎
A thief.
Old 09-19-2019, 12:16 PM
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My vote would be trip F300s.

Ask skip what ratio they rig one to another. I would bet the F300s are more popular and will have better resale.

Do you have a dealer that knows the XF425s well? Most Yam service guys know the F300s well and they have a good history too.
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Old 09-19-2019, 01:14 PM
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It sounds like the benefits and drawbacks of each basically cancel each other out.
You said the $8,000 difference isn't a deciding factor.
So the deciding factor may as well come down to the currently unknown reliability and longevity of the 425 vs the known reliability of the 300.
For me, that would tip the scales in the direction of the 300's. Nothing against the 425's, but when all else is equal and you have a 'known' vs an 'unknown,' I'm avoiding the unknown. It might be a different result if you had something appreciable to gain by risking the unknown, but it sounds like all other determining factors offset.
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Old 09-19-2019, 01:32 PM
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twins
Old 09-19-2019, 01:34 PM
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I would do the pair. The drag from the third engine is probably close to the HP difference.
Old 09-19-2019, 01:39 PM
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Originally Posted by Parker Yacht View Post
A thief.
that one made me laugh....

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